Capstan



llivrrnn Brains Farrar @erica BENJAMIN G. LUTHER, `OF MANSFIELD, MASSACIIUSETTS.

CAPSTAN.

lECIFlLCAI'ION forming part of Letters Patent No. 306,411, dated October 14, 1884.

Application iiled July 14, 1884.

To all whom, z may concern: l

Be it known that I, BENJriMiN G. LUTHER, of Manseld, in the county of Bristol and State of Massachusetts, have invented an Improvement in Capstans, ot' which the following is a speciiication.

rlhe nature of my invention consists in the improved combination of roller anti-friction bearings with the barrel aud the upright spindle ofthe capstan, as hereinafter set forth.

Figure l is a central vertical section of the capstan provided with my improvement. Fig. 2 is an elevation, and Fig. 3 a horizontal section,of the circularly-connected series of antifriction rolls, adapted for insertion between the internal surface of the barrel and the adjacent cylindrical surface of the fixed upright spindle. Fig. et is a vertical ,section of the barrel ofthe capstan, showing a modification of the shoulder adapted forsupportiug the upper series of anti-friction rolls.

In the accompanying drawings, A is the stationary circular base, at the center of which is located the fixed upright spindle B, over which is placed the loosely-revolving barrel O.

Upon the extremities of a cross-bar, I), se'- curely keyed to the spindle B, are placed the gears E E, which engage with the loose gear F, located upon the spindle B above the fixed bar D, and also engage with the internal gear, G, at the upper end of the barrel C.

Above the loose gear F is placed the handspike-rim H, which is held upon the spindle B by means of the collar I, and over the rim His placed the cover J. The rini H is provided with two or more pivoted dogs, a,which are adapted to engage with the ratchet-teeth 15 at the upper end ot' the barrel C, and also with one or more pivoted dogs, c, adapted to engage with the reversely-directed ratchetteeth d at the upper side of the loose gear F, so that when the rim H is turned in one di- (No model.)

rection the dogs a will cause the direct revo lution of the barrel C in the same direction,

dogs c, by engaging with the ratchet-teeth of the loose gear F, will causea slower and more powerful continued movement of the barrel. The lower end of the barrel C is provided with a chamber, c, adapted to receive the anti-fric tion rolls g g, which are held between the perforatcd rings h 7L, the lower ring 7L resting upon the central upper surface of the base A, and the upper ring L being held under an inwardlyprojecting flange, forminga shoulder, f,which serves to prevent the rolls gg from working upward on the spindle B when subjected to the working strain caused by the revolution of the barrel C in winding up a rope or cable under tension. rIhe upper end of the barrel C is provided with a central recess, j, the bot tom of which serves to form a shoulder, 7.', adaptedto support the antifriction rolls g' g at the upper end of the fixed spindle B.

A modification of my invention is shown in Fig. 4t, which shows the rolls g g as supported by means of a sleeve, m, encircling the spindie B, the supportingshoulder It' being thus formed at the upper end of the sleeve. The barrel C is prevented from turning backward and when turned in the opposite direction the 45 L by means of pawls Z at the base of the barrel v and ratchet-teeth upon the upper surface of the stationary bed A.

I cla-iin as my invention- In a capstan, the combination ot' the base A, upright spindle B, and barrel C with the retainingshoulder t', supportingfshoulder ic, the series of rolls g g g g', and the perforated rings 7L h, which connect the rolls, substantially as described.

BENJAMIN G. LUTHER. Vitnesses:

SOCRATES ScHoLFrnLn, Cuirs. F. Sci-mmm. 

